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I would like to find some images in which there are logical inconsistencies. I want to use them for practicing my attention towards those kinds of logical errors (so that I could more easily spot them in my dreams, I am not sure if this works, but I just want to test.). I remember back in the high school someone showed me a picture where one is supposed to find such logical inconsistencies and picture included shadows facing wrong directions, things affected by winds in different directions etc.